Silencer



Dec. 3, 1935. s D 2,022,899

SILENCER Filed Oct. 8, 1934 2 INVENTOR. a? BY 6% 21 M W ATTORNEY.

Patented Dec. 3, 1935 UNITED STATES PATENT OFFICE 2,922,899 I SILENCER Sidney Oldberg; Detroit, Mich. Application mm 8, 1934, Serial No. 741,401

lClalm.

application discloses a silencer of the triple-pass type having an outer casing partitioned by a novel partitioning structure to provide three longitudinally juxtaposed siliencer units, each of which has an inner through-flow tube and a space surrounding the tube.

The silencer of this application is characterized by its novel partitioning structure and by its being extremely sturdy of construction, while economical of manufacture, and differs from heretofore known triple-pass silencers of the type under consideration in certain detailsof con- StlltOtlOl'l and in the arrangement of the silencer uni s. I

The details of construction ,and the features of the silencer disclosed herein will best be understood upon reference to the appended drawing,

whose Fig. 1.is a longitudinal elevational section; and whose Fi 2 is a tranverse section as if on 1ine 2-2- that communicates the expansion chambers J3.

These tubes are supported in flanged openings of the headers in a conventional and well-known fashion.

For isolating the spaces I1 around the various tubes from one another and thus to form relatively isolated, longitudinally arranged compartments for silencer units of the resonance type, there is provided within the outer casing I ll a partition arrangement which'diilers from par-. tition arrangements heretofore known. The partition arrangement here shown includes a substantially circular shell 20, connecting the intermediate headers, and surrounding the 'inlet tube i4 and disposed within and intangential engagement with the casing III, the ends of the shell being supported on circular steps 2i formed in the intermedia e headers. Connecting the shell 20 and the'casing l0 and also connecting the intermediate headers, and disposed within the casing substantially on a plane which is the conjoint dian etrical plane of the casing II and the a shell 20 is a plate 22 having flanged edges 23, whereby it may be welded to the casing and the shell. The plate 22 and the shell 20 provide means for dividing the easing into three relatively isolated, longitudinally arranged spaces, each of 5 which surrounds a through-flow tube.

It will be observed that the space between inlet tube It and shell 20 is provided with a plurality of substantiallycircular transverse diaphragms 25 which transversely partition the shell 20 and provide therein a multiplicity of chambers. I

It will also be observed that the through-flow tubes are provided with a multiplicity of perforations 26, and that these are shown as arranged in spaced groups; in the case of the tube ll, within the shell 20, the tube is perforated sub.- stantially uniformly and continuously throughout its length, but at spaced points along the tube the perforations areblocked and closed by the collars 21 of the diaphragm 25, so as to be rendered ineffectual; therefore, even tube Il may be considered as having its perforations arranged in spaced groups. I

It will also be observed that theshell 20 is provided with a plurality of openings 28 whereby the interior of the shell 20 may be placed incommunication with each of the spaces'around the tubes I l.

The silencer here shown possesses many ad vantages over silencers heretofore known, and 30 some of these will now be enumerated. I For one thing, the silencer hero shown, though extremely economical of manufacture, is well braced internally by virtue of the cooperation of the'shell 20 and the plate 2|; and that this arrangement of internal bracing means; though highly efllcient because the shell 20, being substantially circular,

- is a brace of maximum strength, and because the shell 20 is disposed around the inlet one of the tubes' I 4, which is the highest pressure part of 40 the silencer, where maximum bracing is most desirable, is also a most economically manufactured arrangement. I

Furthermore, by virtue of the fact that the shell 2. is circular or substantially circular, the diaphragms 25 are also economical of manufacture, being circular, and that this would not bethe case if the shell II were of triangular or other irregular form.

Further, since. shell 2| is substantially circular, the steps 24 of the intermediate headers are also substantially circular, and this provides an efilclent and easily made and assembled seat for the shell 20, and that this would not be the case if the shell 20 were made up of a plurality of flat or substantially flat plates, it being observed that it is easier to provide circular steps in the intermediate headers than steps of irregular formation.

While the shell 20 is shown exactly circular, it is well understood that for many purposes this shell may be slightly non-circular if desired, although the exactly circular form is prefered in order to attain certain of the functional and manufacturcular'shell independent of and disposed within and tangentially engaging the casing, and having openings communicating its interior with one of the two compartments on opposite sides of a longitudinally extending plate connecting the shell and casing, and disposed on the conjoint diametrical plane of the shell and easing, the shell and the plate connecting the intermediate headers, each compartment having a longitudinally extending substantially foraminous circular l0 through-flow tube thereinspaced from the loni gitudinal walls thereof and connecting the inter-.5 mediate headers, and transverse circular diaphragms within the shell compartment and through which passes the tube therein, the ends of the compartments being closed by the inter mediate headers, and circular formations on the intermediate headers seating the ends of the shell and the ends of the tubes, two of said tubes having parts extending through said endv chambers to communicate the interior of the silencer with the outside thereof.

SIDNEY OLDBERG. 

